X-Men 2 (2003)

Continuity mistake: In the end, when the President is visited by the X-Men, he receives a blue binder, which is laid in front of him on the table. When they have left, you see a shot including the President's desk, and you can see that the only thing he has on the table are some sheets of paper, stapled in the upper left corner, opened up. Then the shot changes to a close-up of the President, and then back again, and you see the blue binder in front of him, closed, and the papers have disappeared. (02:01:40)

Pyro: You know all those dangerous mutants you hear about in the news? I'm the worst one.

Trivia: Magneto is reading 'The Once and Future King' by T H White. In the novel Merlin is trapped in a crystal cave - Magneto in a similar plastic/glass cave.

Question: Why does Charles look out of the window in the end of the movie, when he's teaching a class?